Keystone, SD Demographics

A map of Keystone's Population by Race

Keystone, South Dakota has an estimated population of 336, a dramatic increase from the 240 recorded in the 2020 Census. The population is 63.7% White, 23.8% Hispanic, 11.0% Multiracial, 0.9% Native American/Other, 0.6% Asian, and 0.0% Black. This demographic dot map shows the population of Keystone, with one dot drawn for each person counted by the Census, color-coded by race.

Keystone has become considerably more racially diverse since the 2020 Census. It is considerably more diverse than South Dakota overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Keystone, that probability was 24.2% in 2020 and 52.5% in the most recent ACS estimates.

Keystone is ranked the 188th most populous place in South Dakota, out of 485 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Keystone was ranked the 214th most populous place in the 2020 Census.

Keystone's White Population

214 residents of Keystone, or 63.7% of the population, identify as White. The share of White residents in Keystone is significantly lower than in South Dakota overall, where 79.8% of the population is White. Keystone ranks 306th statewide in terms of White residents as a share of the population, out of 485 places.

Since the 2020 Census, Keystone's White population has grown by an estimated 2.9%. White residents' share of Keystone's population has decreased from 86.7% to 63.7%.

Keystone is less White than neighboring Hill City (84.1% White), Colonial Pine Hills (93.8% White), Johnson Siding (90.8% White), Custer (86.4% White), and Hermosa (79.9% White).

Keystone's Black Population

0 residents of Keystone, or 0.0% of the population, identify as Black. The share of Black residents in Keystone is slightly lower than in South Dakota overall, where 2.1% of the population is Black. Keystone ranks 183rd statewide in terms of Black residents as a share of the population, out of 485 places.

Since the 2020 Census, Keystone's Black population has grown from 0 to an estimated 0. Black residents' share of Keystone's population has remained roughly unchanged at 0.0%.

Keystone's Asian Population

2 residents of Keystone, or 0.6% of the population, identify as Asian. The share of Asian residents in Keystone is comparable to the share in South Dakota overall, where 1.4% of the population is Asian. Keystone ranks 117th statewide in terms of Asian residents as a share of the population, out of 485 places.

Since the 2020 Census, Keystone's Asian population has grown by an estimated 100.0%. Asian residents' share of Keystone's population has remained roughly unchanged at 0.6%.

Keystone is more Asian than neighboring Hill City (0% Asian), and Johnson Siding (0% Asian). Keystone is less Asian than neighboring Colonial Pine Hills (1.2% Asian), Custer (1.2% Asian), and Hermosa (1.1% Asian).

Keystone's Hispanic Population

80 residents of Keystone, or 23.8% of the population, identify as Hispanic. The share of Hispanic residents in Keystone is significantly higher than in South Dakota overall, where 4.8% of the population is Hispanic. Keystone ranks 76th statewide in terms of Hispanic residents as a share of the population, out of 485 places.

Since the 2020 Census, Keystone's Hispanic population has grown by an estimated 471.4%. Hispanic residents' share of Keystone's population has increased from 5.8% to 23.8%.

Keystone is more Hispanic than neighboring Hill City (6.1% Hispanic), Colonial Pine Hills (0% Hispanic), Johnson Siding (0% Hispanic), Custer (2.2% Hispanic), and Hermosa (8.5% Hispanic).

Keystone's Native American/Other Population

3 residents of Keystone, or 0.9% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Keystone is lower than in South Dakota overall, where 7.5% of the population is Native American/Other. Keystone ranks 232nd statewide in terms of Native American/Other residents as a share of the population, out of 485 places.

Since the 2020 Census, Keystone's Native American/Other population has declined by an estimated 25.0%. Native American/Other residents' share of Keystone's population has decreased from 1.7% to 0.9%.

Keystone is more Native American/Other than neighboring Hill City (0.1% Native American/Other), and Colonial Pine Hills (0% Native American/Other). Keystone is less Native American/Other than neighboring Johnson Siding (8% Native American/Other), Custer (3.2% Native American/Other), and Hermosa (5.1% Native American/Other).

Keystone's Multiracial Population

37 residents of Keystone, or 11.0% of the population, identify as Multiracial. The share of Multiracial residents in Keystone is higher than in South Dakota overall, where 4.4% of the population is Multiracial. Keystone ranks 94th statewide in terms of Multiracial residents as a share of the population, out of 485 places.

Since the 2020 Census, Keystone's Multiracial population has grown by an estimated 184.6%. Multiracial residents' share of Keystone's population has increased from 5.4% to 11.0%.

Keystone is more Multiracial than neighboring Hill City (9.7% Multiracial), Colonial Pine Hills (5% Multiracial), Johnson Siding (1.3% Multiracial), Custer (6.9% Multiracial), and Hermosa (5.4% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.